Home Postcode finder WA Mardella Mardella postcode WA Mardella is a locality in Western Australia covered by postcode 6125. Postcode 6125 State or territory Western Australia (WA) Region North West Suburbs Add a free Mardella business listing Be the first listing in Mardella Common questionsWhat is the postcode for Mardella?Mardella, WA has the postcode 6125.What state is Mardella in?Mardella is in Western Australia (WA).Does postcode 6125 cover more than one suburb?Yes. Postcode 6125 covers 3 localities, so the postcode alone does not identify Mardella. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.